Circles and Triangles
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79a34396e7
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8d36a12a32
2 changed files with 163 additions and 5 deletions
164
lib_sharp.c
164
lib_sharp.c
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@ -277,11 +277,165 @@ void sharp_display_draw_filled_rectangle(sharp_display_t * display, uint16_t x,
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w = min_uint16(w, display->width);
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h = min_uint16(h, display->height);
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for (uint16_t i = 0; i < h; i += 1)
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for (; y < h; y += 1)
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{
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for (uint16_t j = 0; j < w; j += 1)
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{
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sharp_display_draw_pixel(display, x + j, y + i, color);
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}
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sharp_display_draw_line(display, x, y, x + w, y, color);
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}
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}
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void sharp_display_draw_circle(sharp_display_t * display, uint16_t x, uint16_t y, uint16_t r, uint16_t color)
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{
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int16_t f = 1 - r;
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int16_t ddfx = 1;
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int16_t ddfy = -2 * r;
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int16_t x0 = 0;
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int16_t y0 = r;
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sharp_display_draw_pixel(display, x, y + r, color);
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sharp_display_draw_pixel(display, x, y - r, color);
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sharp_display_draw_pixel(display, x + r, y, color);
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sharp_display_draw_pixel(display, x - r, y, color);
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while (x0 < y0)
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{
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if (f >= 0)
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{
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y0 -= 1;
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ddfy += 2;
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f += ddfy;
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}
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x0 += 1;
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ddfx += 2;
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f += ddfx;
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sharp_display_draw_pixel(display, x + x0, y + y0, color);
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sharp_display_draw_pixel(display, x - x0, y + y0, color);
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sharp_display_draw_pixel(display, x + x0, y - y0, color);
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sharp_display_draw_pixel(display, x - x0, y - y0, color);
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sharp_display_draw_pixel(display, x + y0, y + x0, color);
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sharp_display_draw_pixel(display, x - y0, y + x0, color);
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sharp_display_draw_pixel(display, x + y0, y - x0, color);
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sharp_display_draw_pixel(display, x - y0, y - x0, color);
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}
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}
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void sharp_display_draw_filled_circle(sharp_display_t * display, uint16_t x, uint16_t y, uint16_t r, uint16_t color)
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{
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int16_t f = 1 - r;
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int16_t ddfx = 1;
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int16_t ddfy = -2 * r;
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int16_t x0 = 0;
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int16_t y0 = r;
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sharp_display_draw_line(display, x, y - r, x, y + r, color);
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while (x0 < y0)
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{
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if (f >= 0)
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{
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y0 -= 1;
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ddfy += 2;
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f += ddfy;
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}
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x0 += 1;
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ddfx += 2;
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f += ddfx;
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sharp_display_draw_line(display, x + x0, y - y0, x + x0, y + y0, color);
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sharp_display_draw_line(display, x + y0, y - x0, x + y0, y + x0, color);
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sharp_display_draw_line(display, x - x0, y - y0, x - x0, y + y0, color);
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sharp_display_draw_line(display, x - y0, y - x0, x - y0, y + x0, color);
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}
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}
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void sharp_display_draw_triangle(sharp_display_t * display, uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t color)
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{
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sharp_display_draw_line(display, x0, y0, x1, y1, color);
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sharp_display_draw_line(display, x1, y1, x2, y2, color);
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sharp_display_draw_line(display, x2, y2, x0, y0, color);
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}
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void sharp_display_draw_filled_triangle(sharp_display_t * display, uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t color)
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{
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if (y0 > y1) {
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swap_int16(&y0, &y1);
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swap_int16(&x0, &x1);
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}
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if (y1 > y2) {
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swap_int16(&y2, &y1);
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swap_int16(&x2, &x1);
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}
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if (y0 > y1) {
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swap_int16(&y0, &y1);
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swap_int16(&x0, &x1);
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}
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// Line
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if (y0 == y2)
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{
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int16_t a = x0;
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int16_t b = x0;
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if (x1 < a)
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{
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a = x1;
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} else if (x1 > b)
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{
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b = x1;
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}
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if (x2 < a)
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{
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a = x2;
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} else if (x2 > b)
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{
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b = x2;
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}
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sharp_display_draw_line(display, a, y0, b, y0, color);
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return;
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}
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int16_t dx01 = x1 - x0;
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int16_t dy01 = y1 - y0;
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int16_t dx02 = x2 - x0;
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int16_t dy02 = y2 - y0;
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int16_t dx12 = x2 - x1;
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int16_t dy12 = y2 - y1;
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int16_t sa = 0;
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int16_t sb = 0;
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int16_t a = 0;
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int16_t b = 0;
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int16_t last = y1 - 1;
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if (y1 == y2)
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{
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last = y1;
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}
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int16_t y = y0;
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for (; y <= last; y += 1) {
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a = x0 + sa / dy01;
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b = x0 + sb / dy02;
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sa += dx01;
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sb += dx02;
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sharp_display_draw_line(display, a, y, b, y, color);
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}
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sa = dx12 * (y - y1);
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sb = dx02 * (y - y0);
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for (; y <= y2; y += 1) {
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a = x1 + sa / dy12;
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b = x0 + sb / dy02;
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sa += dx12;
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sb += dx02;
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sharp_display_draw_line(display, a, y, b, y, color);
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}
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}
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@ -40,5 +40,9 @@ void sharp_display_draw_pixel(sharp_display_t * display, uint16_t x, uint16_t y,
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void sharp_display_draw_line(sharp_display_t * display, int16_t x0, int16_t y0, int16_t x1, int16_t y1, uint16_t color);
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void sharp_display_draw_rectangle(sharp_display_t * display, uint16_t x, uint16_t y, uint16_t w, uint16_t h, uint16_t color);
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void sharp_display_draw_filled_rectangle(sharp_display_t * display, uint16_t x, uint16_t y, uint16_t w, uint16_t h, uint16_t color);
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void sharp_display_draw_circle(sharp_display_t * display, uint16_t x, uint16_t y, uint16_t r, uint16_t color);
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void sharp_display_draw_filled_circle(sharp_display_t * display, uint16_t x, uint16_t y, uint16_t r, uint16_t color);
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void sharp_display_draw_triangle(sharp_display_t * display, uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t color);
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void sharp_display_draw_filled_triangle(sharp_display_t * display, uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t color);
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#endif
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